Plug-in device



FIG. 1 is a rear elevational view of a plug-in device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an elevational view of the right side thereof, with the left side being a mirror image thereof;

FIG. 4 is a top elevational view thereof; and,

FIG. 5 is a bottom elevational view thereof.

The broken line portion of the figure drawings is included to show unclaimed subject matter only and forms no part of the claimed design. 

CLAIM The ornamental design for a plug-in device, as shown and described. 